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#ifndef NSSCKMDT_H
#define NSSCKMDT_H

#ifdef DEBUG
static const char NSSCKMDT_CVS_ID[] = "@(#) $RCSfile: nssckmdt.h,v $ $Revision: 1.6 $ $Date: 2005/12/16 00:48:01 $";
#endif /* DEBUG */

/*
 * nssckmdt.h
 *
 * This file specifies the basic types that must be implemented by
 * any Module using the NSS Cryptoki Framework.
 */

#ifndef NSSBASET_H
#include "nssbaset.h"
#endif /* NSSBASET_H */

#ifndef NSSCKT_H
#include "nssckt.h"
#endif /* NSSCKT_H */

#ifndef NSSCKFWT_H
#include "nssckfwt.h"
#endif /* NSSCKFWT_H */

typedef struct NSSCKMDInstanceStr NSSCKMDInstance;
typedef struct NSSCKMDSlotStr NSSCKMDSlot;
typedef struct NSSCKMDTokenStr NSSCKMDToken;
typedef struct NSSCKMDSessionStr NSSCKMDSession;
typedef struct NSSCKMDCryptoOperationStr NSSCKMDCryptoOperation;
typedef struct NSSCKMDFindObjectsStr NSSCKMDFindObjects;
typedef struct NSSCKMDMechanismStr NSSCKMDMechanism;
typedef struct NSSCKMDObjectStr NSSCKMDObject;

/*
 * NSSCKFWItem
 *
 * This is a structure used by modules to return object attributes.
 * The needsFreeing bit indicates whether the object needs to be freed.
 * If so, the framework will call the FreeAttribute function on the item
 * after it is done using it.
 *
 */

typedef struct {
  PRBool needsFreeing;
  NSSItem* item;
} NSSCKFWItem ;

/*
 * NSSCKMDInstance
 *
 * This is the basic handle for an instance of a PKCS#11 Module.
 * It is returned by the Module's CreateInstance routine, and
 * may be obtained from the corresponding NSSCKFWInstance object.
 * It contains a pointer for use by the Module, to store any
 * instance-related data, and it contains the EPV for a set of
 * routines which the Module may implement for use by the Framework.
 * Some of these routines are optional; others are mandatory.
 */

struct NSSCKMDInstanceStr {
  /*
   * The Module may use this pointer for its own purposes.
   */
  void *etc;

  /*
   * This routine is called by the Framework to initialize
   * the Module.  This routine is optional; if unimplemented,
   * it won't be called.  If this routine returns an error,
   * then the initialization will fail.
   */
  CK_RV (PR_CALLBACK *Initialize)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance,
    NSSUTF8 *configurationData
  );

  /*
   * This routine is called when the Framework is finalizing
   * the PKCS#11 Module.  It is the last thing called before
   * the NSSCKFWInstance's NSSArena is destroyed.  This routine
   * is optional; if unimplemented, it merely won't be called.
   */
  void (PR_CALLBACK *Finalize)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine gets the number of slots.  This value must
   * never change, once the instance is initialized.  This 
   * routine must be implemented.  It may return zero on error.
   */
  CK_ULONG (PR_CALLBACK *GetNSlots)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns the version of the Cryptoki standard
   * to which this Module conforms.  This routine is optional;
   * if unimplemented, the Framework uses the version to which
   * ~it~ was implemented.
   */
  CK_VERSION (PR_CALLBACK *GetCryptokiVersion)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns a pointer to a UTF8-encoded string
   * containing the manufacturer ID for this Module.  Only
   * the characters completely encoded in the first thirty-
   * two bytes are significant.  This routine is optional.
   * The string returned is never freed; if dynamically generated,
   * the space for it should be allocated from the NSSArena
   * that may be obtained from the NSSCKFWInstance.  This
   * routine may return NULL upon error; however if *pError
   * is CKR_OK, the NULL will be considered the valid response.
   */
  NSSUTF8 *(PR_CALLBACK *GetManufacturerID)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns a pointer to a UTF8-encoded string
   * containing a description of this Module library.  Only
   * the characters completely encoded in the first thirty-
   * two bytes are significant.  This routine is optional.
   * The string returned is never freed; if dynamically generated,
   * the space for it should be allocated from the NSSArena
   * that may be obtained from the NSSCKFWInstance.  This
   * routine may return NULL upon error; however if *pError
   * is CKR_OK, the NULL will be considered the valid response.
   */
  NSSUTF8 *(PR_CALLBACK *GetLibraryDescription)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns the version of this Module library.
   * This routine is optional; if unimplemented, the Framework
   * will assume a Module library version of 0.1.
   */
  CK_VERSION (PR_CALLBACK *GetLibraryVersion)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if the Module wishes to
   * handle session objects.  This routine is optional.
   * If this routine is NULL, or if it exists but returns
   * CK_FALSE, the Framework will assume responsibility
   * for managing session objects.
   */
  CK_BBOOL (PR_CALLBACK *ModuleHandlesSessionObjects)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine stuffs pointers to NSSCKMDSlot objects into
   * the specified array; one for each slot supported by this
   * instance.  The Framework will determine the size needed
   * for the array by calling GetNSlots.  This routine is
   * required.
   */
  CK_RV (PR_CALLBACK *GetSlots)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance,
    NSSCKMDSlot *slots[]
  );

  /*
   * This call returns a pointer to the slot in which an event
   * has occurred.  If the block argument is CK_TRUE, the call 
   * should block until a slot event occurs; if CK_FALSE, it 
   * should check to see if an event has occurred, occurred, 
   * but return NULL (and set *pError to CK_NO_EVENT) if one 
   * hasn't.  This routine is optional; if unimplemented, the
   * Framework will assume that no event has happened.  This
   * routine may return NULL upon error.
   */
  NSSCKMDSlot *(PR_CALLBACK *WaitForSlotEvent)(
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance,
    CK_BBOOL block,
    CK_RV *pError
  );

  /*
   * This object may be extended in future versions of the
   * NSS Cryptoki Framework.  To allow for some flexibility
   * in the area of binary compatibility, this field should
   * be NULL.
   */
  void *null;
};


/*
 * NSSCKMDSlot
 *
 * This is the basic handle for a PKCS#11 Module Slot.  It is
 * created by the NSSCKMDInstance->GetSlots call, and may be
 * obtained from the Framework's corresponding NSSCKFWSlot
 * object.  It contains a pointer for use by the Module, to
 * store any slot-related data, and it contains the EPV for
 * a set of routines which the Module may implement for use
 * by the Framework.  Some of these routines are optional.
 */

struct NSSCKMDSlotStr {
  /*
   * The Module may use this pointer for its own purposes.
   */
  void *etc;

  /*
   * This routine is called during the Framework initialization
   * step, after the Framework Instance has obtained the list
   * of slots (by calling NSSCKMDInstance->GetSlots).  Any slot-
   * specific initialization can be done here.  This routine is
   * optional; if unimplemented, it won't be called.  Note that
   * if this routine returns an error, the entire Framework
   * initialization for this Module will fail.
   */
  CK_RV (PR_CALLBACK *Initialize)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine is called when the Framework is finalizing
   * the PKCS#11 Module.  This call (for each of the slots)
   * is the last thing called before NSSCKMDInstance->Finalize.
   * This routine is optional; if unimplemented, it merely 
   * won't be called.  Note: In the rare circumstance that
   * the Framework initialization cannot complete (due to,
   * for example, memory limitations), this can be called with
   * a NULL value for fwSlot.
   */
  void (PR_CALLBACK *Destroy)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns a pointer to a UTF8-encoded string
   * containing a description of this slot.  Only the characters
   * completely encoded in the first sixty-four bytes are
   * significant.  This routine is optional.  The string 
   * returned is never freed; if dynamically generated,
   * the space for it should be allocated from the NSSArena
   * that may be obtained from the NSSCKFWInstance.  This
   * routine may return NULL upon error; however if *pError
   * is CKR_OK, the NULL will be considered the valid response.
   */
  NSSUTF8 *(PR_CALLBACK *GetSlotDescription)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns a pointer to a UTF8-encoded string
   * containing a description of the manufacturer of this slot.
   * Only the characters completely encoded in the first thirty-
   * two bytes are significant.  This routine is optional.  
   * The string  returned is never freed; if dynamically generated,
   * the space for it should be allocated from the NSSArena
   * that may be obtained from the NSSCKFWInstance.  This
   * routine may return NULL upon error; however if *pError
   * is CKR_OK, the NULL will be considered the valid response.
   */
  NSSUTF8 *(PR_CALLBACK *GetManufacturerID)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns CK_TRUE if a token is present in this
   * slot.  This routine is optional; if unimplemented, CK_TRUE
   * is assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetTokenPresent)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if the slot supports removable
   * tokens.  This routine is optional; if unimplemented, CK_FALSE
   * is assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetRemovableDevice)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if this slot is a hardware
   * device, or CK_FALSE if this slot is a software device.  This
   * routine is optional; if unimplemented, CK_FALSE is assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetHardwareSlot)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the version of this slot's hardware.
   * This routine is optional; if unimplemented, the Framework
   * will assume a hardware version of 0.1.
   */
  CK_VERSION (PR_CALLBACK *GetHardwareVersion)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the version of this slot's firmware.
   * This routine is optional; if unimplemented, the Framework
   * will assume a hardware version of 0.1.
   */
  CK_VERSION (PR_CALLBACK *GetFirmwareVersion)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine should return a pointer to an NSSCKMDToken
   * object corresponding to the token in the specified slot.
   * The NSSCKFWToken object passed in has an NSSArena
   * available which is dedicated for this token.  This routine
   * must be implemented.  This routine may return NULL upon
   * error.
   */
  NSSCKMDToken *(PR_CALLBACK *GetToken)(
    NSSCKMDSlot *mdSlot,
    NSSCKFWSlot *fwSlot,
    NSSCKMDInstance *mdInstance,                                    
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This object may be extended in future versions of the
   * NSS Cryptoki Framework.  To allow for some flexibility
   * in the area of binary compatibility, this field should
   * be NULL.
   */
  void *null;
};

/*
 * NSSCKMDToken
 *
 * This is the basic handle for a PKCS#11 Token.  It is created by
 * the NSSCKMDSlot->GetToken call, and may be obtained from the
 * Framework's corresponding NSSCKFWToken object.  It contains a
 * pointer for use by the Module, to store any token-related
 * data, and it contains the EPV for a set of routines which the
 * Module may implement for use by the Framework.  Some of these
 * routines are optional.
 */

struct NSSCKMDTokenStr {
  /*
   * The Module may use this pointer for its own purposes.
   */
  void *etc;

  /*
   * This routine is used to prepare a Module token object for
   * use.  It is called after the NSSCKMDToken object is obtained
   * from NSSCKMDSlot->GetToken.  It is named "Setup" here because
   * Cryptoki already defines "InitToken" to do the process of
   * wiping out any existing state on a token and preparing it for
   * a new use.  This routine is optional; if unimplemented, it
   * merely won't be called.
   */
  CK_RV (PR_CALLBACK *Setup)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine is called by the Framework whenever it notices
   * that the token object is invalid.  (Typically this is when a 
   * routine indicates an error such as CKR_DEVICE_REMOVED).  This
   * call is the last thing called before the NSSArena in the
   * corresponding NSSCKFWToken is destroyed.  This routine is
   * optional; if unimplemented, it merely won't be called.
   */
  void (PR_CALLBACK *Invalidate)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine initialises the token in the specified slot.
   * This routine is optional; if unimplemented, the Framework
   * will fail this operation with an error of CKR_DEVICE_ERROR.
   */

  CK_RV (PR_CALLBACK *InitToken)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSItem *pin,
    NSSUTF8 *label
  );

  /*
   * This routine returns a pointer to a UTF8-encoded string
   * containing this token's label.  Only the characters
   * completely encoded in the first thirty-two bytes are
   * significant.  This routine is optional.  The string 
   * returned is never freed; if dynamically generated,
   * the space for it should be allocated from the NSSArena
   * that may be obtained from the NSSCKFWInstance.  This
   * routine may return NULL upon error; however if *pError
   * is CKR_OK, the NULL will be considered the valid response.
   */
  NSSUTF8 *(PR_CALLBACK *GetLabel)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns a pointer to a UTF8-encoded string
   * containing this token's manufacturer ID.  Only the characters
   * completely encoded in the first thirty-two bytes are
   * significant.  This routine is optional.  The string 
   * returned is never freed; if dynamically generated,
   * the space for it should be allocated from the NSSArena
   * that may be obtained from the NSSCKFWInstance.  This
   * routine may return NULL upon error; however if *pError
   * is CKR_OK, the NULL will be considered the valid response.
   */
  NSSUTF8 *(PR_CALLBACK *GetManufacturerID)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns a pointer to a UTF8-encoded string
   * containing this token's model name.  Only the characters
   * completely encoded in the first thirty-two bytes are
   * significant.  This routine is optional.  The string 
   * returned is never freed; if dynamically generated,
   * the space for it should be allocated from the NSSArena
   * that may be obtained from the NSSCKFWInstance.  This
   * routine may return NULL upon error; however if *pError
   * is CKR_OK, the NULL will be considered the valid response.
   */
  NSSUTF8 *(PR_CALLBACK *GetModel)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns a pointer to a UTF8-encoded string
   * containing this token's serial number.  Only the characters
   * completely encoded in the first thirty-two bytes are
   * significant.  This routine is optional.  The string 
   * returned is never freed; if dynamically generated,
   * the space for it should be allocated from the NSSArena
   * that may be obtained from the NSSCKFWInstance.  This
   * routine may return NULL upon error; however if *pError
   * is CKR_OK, the NULL will be considered the valid response.
   */
  NSSUTF8 *(PR_CALLBACK *GetSerialNumber)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns CK_TRUE if the token has its own
   * random number generator.  This routine is optional; if
   * unimplemented, CK_FALSE is assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetHasRNG)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if this token is write-protected.
   * This routine is optional; if unimplemented, CK_FALSE is
   * assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetIsWriteProtected)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if this token requires a login.
   * This routine is optional; if unimplemented, CK_FALSE is
   * assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetLoginRequired)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if the normal user's PIN on this
   * token has been initialised.  This routine is optional; if
   * unimplemented, CK_FALSE is assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetUserPinInitialized)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if a successful save of a
   * session's cryptographic operations state ~always~ contains
   * all keys needed to restore the state of the session.  This
   * routine is optional; if unimplemented, CK_FALSE is assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetRestoreKeyNotNeeded)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if the token has its own
   * hardware clock.  This routine is optional; if unimplemented,
   * CK_FALSE is assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetHasClockOnToken)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if the token has a protected
   * authentication path.  This routine is optional; if
   * unimplemented, CK_FALSE is assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetHasProtectedAuthenticationPath)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns CK_TRUE if the token supports dual
   * cryptographic operations within a single session.  This
   * routine is optional; if unimplemented, CK_FALSE is assumed.
   */
  CK_BBOOL (PR_CALLBACK *GetSupportsDualCryptoOperations)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * XXX fgmr-- should we have a call to return all the flags
   * at once, for folks who already know about Cryptoki?
   */

  /*
   * This routine returns the maximum number of sessions that
   * may be opened on this token.  This routine is optional;
   * if unimplemented, the special value CK_UNAVAILABLE_INFORMATION
   * is assumed.  XXX fgmr-- or CK_EFFECTIVELY_INFINITE?
   */
  CK_ULONG (PR_CALLBACK *GetMaxSessionCount)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the maximum number of read/write
   * sesisons that may be opened on this token.  This routine
   * is optional; if unimplemented, the special value
   * CK_UNAVAILABLE_INFORMATION is assumed.  XXX fgmr-- or 
   * CK_EFFECTIVELY_INFINITE?
   */
  CK_ULONG (PR_CALLBACK *GetMaxRwSessionCount)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the maximum PIN code length that is
   * supported on this token.  This routine is optional;
   * if unimplemented, the special value CK_UNAVAILABLE_INFORMATION
   * is assumed.
   */
  CK_ULONG (PR_CALLBACK *GetMaxPinLen)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the minimum PIN code length that is
   * supported on this token.  This routine is optional; if
   * unimplemented, the special value CK_UNAVAILABLE_INFORMATION
   *  is assumed.  XXX fgmr-- or 0?
   */
  CK_ULONG (PR_CALLBACK *GetMinPinLen)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the total amount of memory on the token
   * in which public objects may be stored.  This routine is
   * optional; if unimplemented, the special value
   * CK_UNAVAILABLE_INFORMATION is assumed.
   */
  CK_ULONG (PR_CALLBACK *GetTotalPublicMemory)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the amount of unused memory on the
   * token in which public objects may be stored.  This routine
   * is optional; if unimplemented, the special value
   * CK_UNAVAILABLE_INFORMATION is assumed.
   */
  CK_ULONG (PR_CALLBACK *GetFreePublicMemory)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the total amount of memory on the token
   * in which private objects may be stored.  This routine is
   * optional; if unimplemented, the special value
   * CK_UNAVAILABLE_INFORMATION is assumed.
   */
  CK_ULONG (PR_CALLBACK *GetTotalPrivateMemory)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the amount of unused memory on the
   * token in which private objects may be stored.  This routine
   * is optional; if unimplemented, the special value
   * CK_UNAVAILABLE_INFORMATION is assumed.
   */
  CK_ULONG (PR_CALLBACK *GetFreePrivateMemory)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the version number of this token's
   * hardware.  This routine is optional; if unimplemented,
   * the value 0.1 is assumed.
   */
  CK_VERSION (PR_CALLBACK *GetHardwareVersion)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the version number of this token's
   * firmware.  This routine is optional; if unimplemented,
   * the value 0.1 is assumed.
   */
  CK_VERSION (PR_CALLBACK *GetFirmwareVersion)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine stuffs the current UTC time, as obtained from
   * the token, into the sixteen-byte buffer in the form
   * YYYYMMDDhhmmss00.  This routine need only be implemented
   * by token which indicate that they have a real-time clock.
   * XXX fgmr-- think about time formats.
   */
  CK_RV (PR_CALLBACK *GetUTCTime)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_CHAR utcTime[16]
  );

  /*
   * This routine creates a session on the token, and returns
   * the corresponding NSSCKMDSession object.  The value of
   * rw will be CK_TRUE if the session is to be a read/write 
   * session, or CK_FALSE otherwise.  An NSSArena dedicated to
   * the new session is available from the specified NSSCKFWSession.
   * This routine may return NULL upon error.
   */
  NSSCKMDSession *(PR_CALLBACK *OpenSession)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKFWSession *fwSession,
    CK_BBOOL rw,
    CK_RV *pError
  );

  /*
   * This routine returns the number of PKCS#11 Mechanisms
   * supported by this token.  This routine is optional; if
   * unimplemented, zero is assumed.
   */
  CK_ULONG (PR_CALLBACK *GetMechanismCount)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine stuffs into the specified array the types
   * of the mechanisms supported by this token.  The Framework
   * determines the size of the array by calling GetMechanismCount.
   */
  CK_RV (PR_CALLBACK *GetMechanismTypes)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_MECHANISM_TYPE types[]
  );

  /*
   * This routine returns a pointer to a Module mechanism
   * object corresponding to a specified type.  This routine
   * need only exist for tokens implementing at least one
   * mechanism.
   */
  NSSCKMDMechanism *(PR_CALLBACK *GetMechanism)(
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_MECHANISM_TYPE which,
    CK_RV *pError
  );

  /*
   * This object may be extended in future versions of the
   * NSS Cryptoki Framework.  To allow for some flexibility
   * in the area of binary compatibility, this field should
   * be NULL.
   */
  void *null;
};

/*
 * NSSCKMDSession
 *
 * This is the basic handle for a session on a PKCS#11 Token.  It
 * is created by NSSCKMDToken->OpenSession, and may be obtained
 * from the Framework's corresponding NSSCKFWSession object.  It
 * contains a pointer for use by the Module, to store any session-
 * realted data, and it contains the EPV for a set of routines
 * which the Module may implement for use by the Framework.  Some
 * of these routines are optional.
 */

struct NSSCKMDSessionStr {
  /*
   * The Module may use this pointer for its own purposes.
   */
  void *etc;

  /*
   * This routine is called by the Framework when a session is
   * closed.  This call is the last thing called before the
   * NSSArena in the correspoinding NSSCKFWSession is destroyed.
   * This routine is optional; if unimplemented, it merely won't
   * be called.
   */
  void (PR_CALLBACK *Close)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine is used to get any device-specific error.
   * This routine is optional.
   */
  CK_ULONG (PR_CALLBACK *GetDeviceError)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine is used to log in a user to the token.  This
   * routine is optional, since the Framework's NSSCKFWSession
   * object keeps track of the login state.
   */
  CK_RV (PR_CALLBACK *Login)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_USER_TYPE userType,
    NSSItem *pin,
    CK_STATE oldState,
    CK_STATE newState
  );

  /*
   * This routine is used to log out a user from the token.  This
   * routine is optional, since the Framework's NSSCKFWSession
   * object keeps track of the login state.
   */
  CK_RV (PR_CALLBACK *Logout)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_STATE oldState,
    CK_STATE newState
  );

  /*
   * This routine is used to initialize the normal user's PIN or
   * password.  This will only be called in the "read/write
   * security officer functions" state.  If this token has a
   * protected authentication path, then the pin argument will
   * be NULL.  This routine is optional; if unimplemented, the
   * Framework will return the error CKR_TOKEN_WRITE_PROTECTED.
   */
  CK_RV (PR_CALLBACK *InitPIN)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSItem *pin
  );

  /*
   * This routine is used to modify a user's PIN or password.  This
   * routine will only be called in the "read/write security officer
   * functions" or "read/write user functions" state.  If this token
   * has a protected authentication path, then the pin arguments
   * will be NULL.  This routine is optional; if unimplemented, the
   * Framework will return the error CKR_TOKEN_WRITE_PROTECTED.
   */
  CK_RV (PR_CALLBACK *SetPIN)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSItem *oldPin,
    NSSItem *newPin
  );

  /*
   * This routine is used to find out how much space would be required
   * to save the current operational state.  This routine is optional;
   * if unimplemented, the Framework will reject any attempts to save
   * the operational state with the error CKR_STATE_UNSAVEABLE.  This
   * routine may return zero on error.
   */
  CK_ULONG (PR_CALLBACK *GetOperationStateLen)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine is used to store the current operational state.  This
   * routine is only required if GetOperationStateLen is implemented 
   * and can return a nonzero value.  The buffer in the specified item
   * will be pre-allocated, and the length will specify the amount of
   * space available (which may be more than GetOperationStateLen
   * asked for, but which will not be smaller).
   */
  CK_RV (PR_CALLBACK *GetOperationState)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSItem *buffer
  );

  /*
   * This routine is used to restore an operational state previously
   * obtained with GetOperationState.  The Framework will take pains
   * to be sure that the state is (or was at one point) valid; if the
   * Module notices that the state is invalid, it should return an
   * error, but it is not required to be paranoid about the issue.
   * [XXX fgmr-- should (can?) the framework verify the keys match up?]
   * This routine is required only if GetOperationState is implemented.
   */
  CK_RV (PR_CALLBACK *SetOperationState)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSItem *state,
    NSSCKMDObject *mdEncryptionKey,
    NSSCKFWObject *fwEncryptionKey,
    NSSCKMDObject *mdAuthenticationKey,
    NSSCKFWObject *fwAuthenticationKey
  );

  /*
   * This routine is used to create an object.  The specified template
   * will only specify a session object if the Module has indicated 
   * that it wishes to handle its own session objects.  This routine
   * is optional; if unimplemented, the Framework will reject the
   * operation with the error CKR_TOKEN_WRITE_PROTECTED.  Space for
   * token objects should come from the NSSArena available from the
   * NSSCKFWToken object; space for session objects (if supported)
   * should come from the NSSArena available from the NSSCKFWSession
   * object.  The appropriate NSSArena pointer will, as a convenience,
   * be passed as the handyArenaPointer argument.  This routine may
   * return NULL upon error.
   */
  NSSCKMDObject *(PR_CALLBACK *CreateObject)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSArena *handyArenaPointer,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulAttributeCount,
    CK_RV *pError
  );

  /*
   * This routine is used to make a copy of an object.  It is entirely
   * optional; if unimplemented, the Framework will try to use
   * CreateObject instead.  If the Module has indicated that it does
   * not wish to handle session objects, then this routine will only
   * be called to copy a token object to another token object.
   * Otherwise, either the original object or the new may be of
   * either the token or session variety.  As with CreateObject, the
   * handyArenaPointer will point to the appropriate arena for the
   * new object.  This routine may return NULL upon error.
   */
  NSSCKMDObject *(PR_CALLBACK *CopyObject)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdOldObject,
    NSSCKFWObject *fwOldObject,
    NSSArena *handyArenaPointer,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulAttributeCount,
    CK_RV *pError
  );

  /*
   * This routine is used to begin an object search.  This routine may
   * be unimplemented only if the Module does not handle session 
   * objects, and if none of its tokens have token objects.  The
   * NSSCKFWFindObjects pointer has an NSSArena that may be used for
   * storage for the life of this "find" operation.  This routine may
   * return NULL upon error.  If the Module can determine immediately
   * that the search will not find any matching objects, it may return
   * NULL, and specify CKR_OK as the error.
   */
  NSSCKMDFindObjects *(PR_CALLBACK *FindObjectsInit)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulAttributeCount,
    CK_RV *pError
  );

  /*
   * This routine seeds the random-number generator.  It is
   * optional, even if GetRandom is implemented.  If unimplemented,
   * the Framework will issue the error CKR_RANDOM_SEED_NOT_SUPPORTED.
   */
  CK_RV (PR_CALLBACK *SeedRandom)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSItem *seed
  );

  /*
   * This routine gets random data.  It is optional.  If unimplemented,
   * the Framework will issue the error CKR_RANDOM_NO_RNG.
   */
  CK_RV (PR_CALLBACK *GetRandom)(
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSItem *buffer
  );

  /*
   * This object may be extended in future versions of the
   * NSS Cryptoki Framework.  To allow for some flexibility
   * in the area of binary compatibility, this field should
   * be NULL.
   */
  void *null;
};

/*
 * NSSCKMDFindObjects
 *
 * This is the basic handle for an object search.  It is
 * created by NSSCKMDSession->FindObjectsInit, and may be
 * obtained from the Framework's corresponding object.
 * It contains a pointer for use by the Module, to store
 * any search-related data, and it contains the EPV for a
 * set of routines which the Module may implement for use
 * by the Framework.  Some of these routines are optional.
 */

struct NSSCKMDFindObjectsStr {
  /*
   * The Module may use this pointer for its own purposes.
   */
  void *etc;

  /*
   * This routine is called by the Framework to finish a
   * search operation.  Note that the Framework may finish
   * a search before it has completed.  This routine is
   * optional; if unimplemented, it merely won't be called.
   */
  void (PR_CALLBACK *Final)(
    NSSCKMDFindObjects *mdFindObjects,
    NSSCKFWFindObjects *fwFindObjects,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine is used to obtain another pointer to an
   * object matching the search criteria.  This routine is
   * required.  If no (more) objects match the search, it
   * should return NULL and set the error to CKR_OK.
   */
  NSSCKMDObject *(PR_CALLBACK *Next)(
    NSSCKMDFindObjects *mdFindObjects,
    NSSCKFWFindObjects *fwFindObjects,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSArena *arena,
    CK_RV *pError
  );

  /*
   * This object may be extended in future versions of the
   * NSS Cryptoki Framework.  To allow for some flexibility
   * in the area of binary compatibility, this field should
   * be NULL.
   */
  void *null;
};

/*
 * NSSCKMDCryptoOperaion
 *
 * This is the basic handle for an encryption, decryption,
 * sign, verify, or hash opertion.
 * created by NSSCKMDMechanism->XXXXInit, and may be
 * obtained from the Framework's corresponding object.
 * It contains a pointer for use by the Module, to store
 * any intermediate data, and it contains the EPV for a
 * set of routines which the Module may implement for use
 * by the Framework.  Some of these routines are optional.
 */

struct NSSCKMDCryptoOperationStr {
  /*
   * The Module may use this pointer for its own purposes.
   */
  void *etc;

  /*
   * This routine is called by the Framework clean up the mdCryptoOperation
   * structure.
   * This routine is optional; if unimplemented, it will be ignored.
   */
  void (PR_CALLBACK *Destroy)(
    NSSCKMDCryptoOperation *mdCryptoOperation,
    NSSCKFWCryptoOperation *fwCryptoOperation,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );


  /*
   * how many bytes do we need to finish this buffer?
   * must be implemented if Final is implemented.
   */
  CK_ULONG (PR_CALLBACK *GetFinalLength)(
    NSSCKMDCryptoOperation *mdCryptoOperation,
    NSSCKFWCryptoOperation *fwCryptoOperation,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * how many bytes do we need to complete the next operation.
   * used in both Update and UpdateFinal.
   */
  CK_ULONG (PR_CALLBACK *GetOperationLength)(
    NSSCKMDCryptoOperation *mdCryptoOperation,
    NSSCKFWCryptoOperation *fwCryptoOperation,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    const NSSItem   *inputBuffer,
    CK_RV *pError
  );

  /*
   * This routine is called by the Framework to finish a
   * search operation.  Note that the Framework may finish
   * a search before it has completed.  This routine is
   * optional; if unimplemented, it merely won't be called.
   * The respective final call with fail with CKR_FUNCTION_FAILED
   * Final should not free the mdCryptoOperation.
   */
  CK_RV(PR_CALLBACK *Final)(
    NSSCKMDCryptoOperation *mdCryptoOperation,
    NSSCKFWCryptoOperation *fwCryptoOperation,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSItem       *outputBuffer
  );


  /*
   * This routine is called by the Framework to complete the
   * next step in an encryption/decryption operation.
   * This routine is optional; if unimplemented, the respective
   * update call with fail with CKR_FUNCTION_FAILED.
   * Update should not be implemented for signing/verification/digest
   * mechanisms.
   */
  CK_RV(PR_CALLBACK *Update)(
    NSSCKMDCryptoOperation *mdCryptoOperation,
    NSSCKFWCryptoOperation *fwCryptoOperation,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    const NSSItem   *inputBuffer,
    NSSItem   *outputBuffer
  );

  /*
   * This routine is called by the Framework to complete the
   * next step in a signing/verification/digest operation.
   * This routine is optional; if unimplemented, the respective
   * update call with fail with CKR_FUNCTION_FAILED
   * Update should not be implemented for encryption/decryption
   * mechanisms.
   */
  CK_RV(PR_CALLBACK *DigestUpdate)(
    NSSCKMDCryptoOperation *mdCryptoOperation,
    NSSCKFWCryptoOperation *fwCryptoOperation,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    const NSSItem   *inputBuffer
  );

  /*
   * This routine is called by the Framework to complete a
   * single step operation. This routine is optional; if unimplemented, 
   * the framework will use the Update and Final functions to complete
   * the operation.
   */
  CK_RV(PR_CALLBACK *UpdateFinal)(
    NSSCKMDCryptoOperation *mdCryptoOperation,
    NSSCKFWCryptoOperation *fwCryptoOperation,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    const NSSItem   *inputBuffer,
    NSSItem   *outputBuffer
  );

  /*
   * This routine is called by the Framework to complete next
   * step in a combined operation. The Decrypt/Encrypt mechanism
   * should define and drive the combo step.
   * This routine is optional; if unimplemented, 
   * the framework will use the appropriate Update functions to complete
   * the operation.
   */
  CK_RV(PR_CALLBACK *UpdateCombo)(
    NSSCKMDCryptoOperation *mdCryptoOperation,
    NSSCKFWCryptoOperation *fwCryptoOperation,
    NSSCKMDCryptoOperation *mdPeerCryptoOperation,
    NSSCKFWCryptoOperation *fwPeerCryptoOperation,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    const NSSItem   *inputBuffer,
    NSSItem   *outputBuffer
  );

  /*
   * Hash a key directly into the digest
   */
  CK_RV(PR_CALLBACK *DigestKey)(
    NSSCKMDCryptoOperation *mdCryptoOperation,
    NSSCKFWCryptoOperation *fwCryptoOperation,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdKey,
    NSSCKFWObject *fwKey
  );

  /*
   * This object may be extended in future versions of the
   * NSS Cryptoki Framework.  To allow for some flexibility
   * in the area of binary compatibility, this field should
   * be NULL.
   */
  void *null;
};

/*
 * NSSCKMDMechanism
 *
 */

struct NSSCKMDMechanismStr {
  /*
   * The Module may use this pointer for its own purposes.
   */
  void *etc;

  /*
   * This also frees the fwMechanism if appropriate.
   * If it is not supplied, the Framework will assume that the Token
   * Manages a static list of mechanisms and the function will not be called.
   */
  void (PR_CALLBACK *Destroy)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );


  /*
   * This routine returns the minimum key size allowed for
   * this mechanism.  This routine is optional; if unimplemented,
   * zero will be assumed.  This routine may return zero on
   * error; if the error is CKR_OK, zero will be accepted as
   * a valid response.
   */
  CK_ULONG (PR_CALLBACK *GetMinKeySize)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine returns the maximum key size allowed for
   * this mechanism.  This routine is optional; if unimplemented,
   * zero will be assumed.  This routine may return zero on
   * error; if the error is CKR_OK, zero will be accepted as
   * a valid response.
   */
  CK_ULONG (PR_CALLBACK *GetMaxKeySize)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine is called to determine if the mechanism is
   * implemented in hardware or software.  It returns CK_TRUE
   * if it is done in hardware.
   */
  CK_BBOOL (PR_CALLBACK *GetInHardware)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * The crypto routines themselves.  Most crypto operations may
   * be performed in two ways, streaming and single-part.  The
   * streaming operations involve the use of (typically) three
   * calls-- an Init method to set up the operation, an Update
   * method to feed data to the operation, and a Final method to
   * obtain the final result.  Single-part operations involve
   * one method, to perform the crypto operation all at once.
   *
   * The NSS Cryptoki Framework can implement the single-part
   * operations in terms of the streaming operations on behalf
   * of the Module.  There are a few variances.
   *
   * Only the Init Functions are defined by the mechanism. Each
   * init function will return a NSSCKFWCryptoOperation which
   * can supply update, final, the single part updateFinal, and
   * the combo updateCombo functions.
   * 
   * For simplicity, the routines are listed in summary here:
   *
   *  EncryptInit,
   *  DecryptInit,
   *  DigestInit,
   *  SignInit, 
   *  SignRecoverInit;
   *  VerifyInit,
   *  VerifyRecoverInit;
   *
   * The key-management routines are
   *
   *  GenerateKey
   *  GenerateKeyPair
   *  WrapKey
   *  UnwrapKey
   *  DeriveKey
   *
   * All of these routines based on the Cryptoki API; 
   * see PKCS#11 for further information.
   */

  /*
   */
  NSSCKMDCryptoOperation * (PR_CALLBACK *EncryptInit)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdKey,
    NSSCKFWObject *fwKey,
    CK_RV *pError
  );

  /*
   */
  NSSCKMDCryptoOperation * (PR_CALLBACK *DecryptInit)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdKey,
    NSSCKFWObject *fwKey,
    CK_RV *pError
  );

  /*
   */
  NSSCKMDCryptoOperation * (PR_CALLBACK *DigestInit)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );


  /*
   */
  NSSCKMDCryptoOperation * (PR_CALLBACK *SignInit)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdKey,
    NSSCKFWObject *fwKey,
    CK_RV *pError
  );

  /*
   */
  NSSCKMDCryptoOperation * (PR_CALLBACK *VerifyInit)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdKey,
    NSSCKFWObject *fwKey,
    CK_RV *pError
  );

  /*
   */
  NSSCKMDCryptoOperation * (PR_CALLBACK *SignRecoverInit)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdKey,
    NSSCKFWObject *fwKey,
    CK_RV *pError
  );

  /*
   */
  NSSCKMDCryptoOperation * (PR_CALLBACK *VerifyRecoverInit)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdKey,
    NSSCKFWObject *fwKey,
    CK_RV *pError
  );

  /*
   * Key management operations.
   */

  /*
   * This routine generates a key.  This routine may return NULL
   * upon error.
   */
  NSSCKMDObject *(PR_CALLBACK *GenerateKey)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulAttributeCount,
    CK_RV *pError
  );

  /*
   * This routine generates a key pair.
   */
  CK_RV (PR_CALLBACK *GenerateKeyPair)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_PTR pPublicKeyTemplate,
    CK_ULONG ulPublicKeyAttributeCount,
    CK_ATTRIBUTE_PTR pPrivateKeyTemplate,
    CK_ULONG ulPrivateKeyAttributeCount,
    NSSCKMDObject **pPublicKey,
    NSSCKMDObject **pPrivateKey
  );

  /*
   * This routine wraps a key.
   */
  CK_ULONG (PR_CALLBACK *GetWrapKeyLength)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdWrappingKey,
    NSSCKFWObject *fwWrappingKey,
    NSSCKMDObject *mdWrappedKey,
    NSSCKFWObject *fwWrappedKey,
    CK_RV *pError
  );

  /*
   * This routine wraps a key.
   */
  CK_RV (PR_CALLBACK *WrapKey)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdWrappingKey,
    NSSCKFWObject *fwWrappingKey,
    NSSCKMDObject *mdKeyObject,
    NSSCKFWObject *fwKeyObject,
    NSSItem *wrappedKey
  );

  /*
   * This routine unwraps a key.  This routine may return NULL
   * upon error.
   */
  NSSCKMDObject *(PR_CALLBACK *UnwrapKey)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdWrappingKey,
    NSSCKFWObject *fwWrappingKey,
    NSSItem *wrappedKey,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulAttributeCount,
    CK_RV *pError
  );    
    
  /*
   * This routine derives a key.  This routine may return NULL
   * upon error.
   */
  NSSCKMDObject *(PR_CALLBACK *DeriveKey)(
    NSSCKMDMechanism *mdMechanism,
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR  pMechanism,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    NSSCKMDObject *mdBaseKey,
    NSSCKFWObject *fwBaseKey,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulAttributeCount,
    CK_RV *pError
  );    

  /*
   * This object may be extended in future versions of the
   * NSS Cryptoki Framework.  To allow for some flexibility
   * in the area of binary compatibility, this field should
   * be NULL.
   */
  void *null;
};

/*
 * NSSCKMDObject
 *
 * This is the basic handle for any object used by a PKCS#11 Module.
 * Modules must implement it if they support their own objects, and
 * the Framework supports it for Modules that do not handle session
 * objects.  This type contains a pointer for use by the implementor,
 * to store any object-specific data, and it contains an EPV for a
 * set of routines used to access the object.
 */

struct NSSCKMDObjectStr {
  /*
   * The implementation my use this pointer for its own purposes.
   */
  void *etc;

  /*
   * This routine is called by the Framework when it is letting
   * go of an object handle.  It can be used by the Module to
   * free any resources tied up by an object "in use."  It is
   * optional.
   */
  void (PR_CALLBACK *Finalize)(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine is used to completely destroy an object.
   * It is optional.  The parameter fwObject might be NULL
   * if the framework runs out of memory at the wrong moment.
   */
  CK_RV (PR_CALLBACK *Destroy)(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This helper routine is used by the Framework, and is especially
   * useful when it is managing session objects on behalf of the
   * Module.  This routine is optional; if unimplemented, the
   * Framework will actually look up the CKA_TOKEN attribute.  In the
   * event of an error, just make something up-- the Framework will
   * find out soon enough anyway.
   */
  CK_BBOOL (PR_CALLBACK *IsTokenObject)(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance
  );

  /*
   * This routine returns the number of attributes of which this
   * object consists.  It is mandatory.  It can return zero on
   * error.
   */
  CK_ULONG (PR_CALLBACK *GetAttributeCount)(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This routine stuffs the attribute types into the provided array.
   * The array size (as obtained from GetAttributeCount) is passed in
   * as a check; return CKR_BUFFER_TOO_SMALL if the count is wrong
   * (either too big or too small).
   */
  CK_RV (PR_CALLBACK *GetAttributeTypes)(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE_PTR typeArray,
    CK_ULONG ulCount
  );

  /*
   * This routine returns the size (in bytes) of the specified
   * attribute.  It can return zero on error.
   */
  CK_ULONG (PR_CALLBACK *GetAttributeSize)(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE attribute,
    CK_RV *pError
  );

  /*
   * This routine returns an NSSCKFWItem structure.
   * The item pointer points to an NSSItem containing the attribute value.
   * The needsFreeing bit tells the framework whether to call the
   * FreeAttribute function . Upon error, an NSSCKFWItem structure
   * with a NULL NSSItem item pointer will be returned
   */
  NSSCKFWItem (PR_CALLBACK *GetAttribute)(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE attribute,
    CK_RV *pError
  );

  /*
   * This routine returns CKR_OK if the attribute could be freed.
   */
  CK_RV (PR_CALLBACK *FreeAttribute)(
    NSSCKFWItem * item
  );

  /*
   * This routine changes the specified attribute.  If unimplemented,
   * the object will be considered read-only.
   */
  CK_RV (PR_CALLBACK *SetAttribute)(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_ATTRIBUTE_TYPE attribute,
    NSSItem *value
  );

  /*
   * This routine returns the storage requirements of this object,
   * in bytes.  Cryptoki doesn't strictly define the definition,
   * but it should relate to the values returned by the "Get Memory"
   * routines of the NSSCKMDToken.  This routine is optional; if
   * unimplemented, the Framework will consider this information
   * sensitive.  This routine may return zero on error.  If the
   * specified error is CKR_OK, zero will be accepted as a valid
   * response.
   */
  CK_ULONG (PR_CALLBACK *GetObjectSize)(
    NSSCKMDObject *mdObject,
    NSSCKFWObject *fwObject,
    NSSCKMDSession *mdSession,
    NSSCKFWSession *fwSession,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance,
    CK_RV *pError
  );

  /*
   * This object may be extended in future versions of the
   * NSS Cryptoki Framework.  To allow for some flexibility
   * in the area of binary compatibility, this field should
   * be NULL.
   */
  void *null;
};


#endif /* NSSCKMDT_H */
